Prediction of flood peak discharge at landslide dam outburst

Abstract

This paper was written with the objective of introducing bank side erosion and sediment transport equations into a simulation model of the outburst of a landslide dam to improve the projection accuracy when the mass removal of the soil occurs. The targeted model was applied to a drainage basin containing a landslide dam. The following elements were calculated : the peak discharge, the change of the river width, the rate of erosion, and the fluctuation of the riverbed at the site of the landslide dam. It was concluded that the peak discharge downstream of the landslide dam would be 10 times the volume of the inflow. Furthermore, the model was able to better express observed phenomena such as how sites where the river width is narrow or flow volume large are eroded more heavily. In the future, the authors intend to perform a sensitivity analysis of this model to clarify its characteristics based on the supporting data, and create a better sediment discharge forecasting system for the outburst of landslide dams.